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Pundit Lab vs. Pundit Lab+

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We’ve been talking a lot about Pundit Lab and Pundit Lab+… but what’s the difference between these two? And no, it’s not just the “+”. Check out this short article to find out the answer! Hint: One differentiator is shown in the picture!

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Pundit Lab vs. Pundit Lab+

You may or may not have been wondering what the difference is between the Pundit Lab and the Pundit Lab+. However, as you’ve landed on this article, I bet your curiosity has been sparked! Now, let’s get to grips on the finer details differentiating these two models. Pundit Lab models use ultrasonic pulse velocity mainly to determine the quality of concrete and for material characterization of rocks. Pundit Lab is a flexible UPV test instrument designed primarily for operation in laboratories and supports all traditional UPV test modes such as pulse velocity, surface velocity, E-modulus, data logging, and crack depth. It is often used to measure alongside other measurements within a lab setting, and is regularly used for rock testing. The Pundit Lab+ was developed as a result of feedback received on the Pundit Lab and therefore contains an extended feature set to make testing that much easier and to the point. It is used more for concrete testing.

Integrated measurement functions

Both Pundit Lab and Pundit Lab+ can measure Poisson’s Ratio and E-modulus using the Pundit Link software. One significant difference between Pundit Lab and Pundit Lab+ is the integration of the SONREB measurement and compressive strength correlation curves in the Pundit Lab+.

Ultrasonic testing is widely used for rock material characterization. The pulse velocity is directly related to the physical and mechanical properties of the rock. Pundit Lab+ allow an accurate measurement of both compression (P-wave) and shear (S-wave) pulse velocity. The procedure is described in both ASTM and ISRM recommendations. Once these have been determined, the elastic constants of the material, (P-wave modulus, the shear modulus, Poisson’s ratio and dynamic modulus of elasticity) can be calculated.

For those of us who need these terms broken down:

  • Poisson’s ratio is another elastic property of interest to Geologists. This must be calculated first prior to calculating the elastic modulus.
  • E-modulus measurements are carried out extensively in both the concrete industry and the geological world. The UPV E-modulus technique determines the dynamic modulus of elasticity. For concrete it is generally the static modulus that is required, but this is a time-consuming lab test. Many customers have used the dynamic modulus measurement which can even be carried out on-site and developed correlations to static modulus.
  • The SONREB method is a method of combining an ultrasonic pulse velocity measurement with a rebound hammer measurement to improve the accuracy of compressive strength estimation.
  • Compressive strength curves are used for strength correlations to specific concrete mixes or rock types.

You can also measure SONREB and compressive strength using the Pundit Lab, however they must be calculated manually. Because of this, a bit more expertise and technical knowledge is often required. Having these measurement functions directly on the device makes testing a lot easier and time efficient for the user.

Specialized transducers

A wide array of compatible transducers is available to use for both Pundit Lab and Pundit Lab+ ranging from 24 kHz up to 500 kHz for various applications. One benefit Pundit Lab+ has, is that it has an in-built amplifier that allows it to be used with our 54 kHz Exponential transducers. This makes it possible to test on round, uneven or rough surfaces such as on wood, historical structures, and columns. Another benefit to using these Exponential transducers, is that you don’t need couplant to perform your measurements.

Pundit Link PC Software

Pundit Link software allows you to remotely control the Pundit Lab in, for example, lab environments, and to view the waveform directly on the PC screen. “Live view” mode allows the remote control of all parameters and waveform display directly on PC including manual setting of trigger point. It is also used to calculate E-modulus and Poisson’s Ratio and allows you to save and export your data easily.

Waveform displays

Pundit Lab and Pundit Lab+ allow its user to view the waveform in three different displays. The waveform can be seen directly on the instrument, allowing manual adjustment of triggering point on-site and horizontal and vertical zoom controls. The waveform can also be viewed on an external oscilloscope. The waveform can also be viewed directly on a connected PC using the Pundit Link software. “Live view” mode turns any PC or laptop into an oscilloscope.

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Open interface

Pundit Lab and Pundit Lab+ have an open interface that can be remotely controlled by third party software such as LabVIEW for integrating into laboratory set-ups. This is especially beneficial when performing various types of measurements and gathering them into one database.

The remote control interface document providing complete instructions is available in the downloads section on the Proceq website www.proceq.com.

Reporting needs

If reporting is a vital aspect to your UPV testing needs, Pundit Lab+ has an integrated “time stamp,” a real-time clock to provide the time of every measurement recorded. It also contains a “Review list” where saved measurements can be reviewed directly on-site without having to connect to your computer.

Equipment Features

As a final round up of everything discussed, here is a brief overview of the shared technical features of the Pundit Lab and Pundit Lab+, as well as the additional features added to create the Pundit Lab+.